摘要
在连续式超临界水氧化试验装置中 ,测量了 31 6不锈钢和 82 5镍基合金在 1 50℃～ 450℃分解杀虫剂毒死蜱过程中的腐蚀速度 .两种合金的均匀腐蚀速度随温度升高而增加 ,82 5镍基合金的腐蚀速度比 31 6不锈钢的腐蚀速度小 ,450℃下 31 6不锈钢和 82 5镍基合金的均匀腐蚀速度分别达 1 4 3μm/h和 1 2 5μm/h ;2 0 0℃以上发生孔蚀 ,在较高分解温度下 ,由于孔蚀和均匀腐蚀的同时进行 ,形成相互贯穿的敞口蚀坑腐蚀形貌 .热力学分析表明 ,Fe -Cr-Ni合金在高温氧化性介质中是不稳定的 。
Corrosion of 316 stainless steel and 825 nickel base alloy in medium of supercritical water oxidizing (SCWO) a pesticide chlorpyrifos has been studied at temperature 150～450℃ by using a continuous SCWO facility.General corrosion rates of the alloys increase with increase of temperature.825 nickel base alloy has smaller corrosion rate than 316 stainless steel.At 450℃corrosion rates were 14 3μm/h and 12 5μm/h respectively for 316 stainless steel and 825 nickel base alloy.Pitting corrosion occurs at temperature higher than 200℃.Pitting corrosion plus general dissolution at higher temperatures results in wide open pit corrosion morphology.Thermodynamic analysis shows that Fe-Cr-Ni alloys is not stable in SCWO conditions because Cr 2O 3 is not stable in these conditions.Formation of low melt point metal chlorides may also be a reason for the high corrosion rates of the alloys.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2002年第4期187-190,共4页
Corrosion Science and Protection Technology
基金
国家基金项目 ( 597710 6 5)
金属腐蚀与防护国家重点实验室资助项目
